White African Opal 6mm Round w/ Red Matrix - 15-16 Inch Eagle Eye Azurite in crystal form is

Azurite in crystal form is extremely rare and expensive

or in the vesicles and intergranular spaces of rhyolite

it is a form of hydrated amorphous silica

and Cutter

Hemimorphite is a favorite collector gem because it occurs in a range of spectacular colors

White African Opal 6mm Round w/ Red Matrix - 15-16 Inch Eagle Eye Azurite in crystal form isWhite African Opal is a white to cream to light tan stone with veining of black or gray. Like all Opals, it is a form of hydrated amorphous silica, however it does not exhibit the play of color seen in precious Opal. Common Opals such as White African Opal are believed to provide gentle, nurturing emotional support.